A minimal, portable camera preview + still capture demo using Qt Multimedia.

• Detects first available camera
• Live preview inside a QVideoWidget
• Capture JPEG/PNG to disk on button press
• Pure Qt (no external libs)

• Qt 6.6+ (tested with 6.7.x)
• CMake 3.21+

mkdir -p build cmake -S . -B build -DCMAKE_PREFIX_PATH=/path/to/Qt/6.x/gcc_64 cmake --build build -j ./build/QtCameraDemo

cmake -S . -B build -G "Ninja" -DCMAKE_PREFIX_PATH=C:\Qt\6.x\msvc2022_64 cmake --build build build\QtCameraDemo.exe

cmake -S . -B build -DCMAKE_PREFIX_PATH="$(brew --prefix qt)" cmake --build build -j open build/QtCameraDemo.app

For redistribution on macOS:

/opt/homebrew/opt/qt/bin/macdeployqt build/QtCameraDemo.app -verbose=2 

• macOS: Info.plist declares NSCameraUsageDescription. First run will prompt for access. If you denied earlier: tccutil reset Camera com.ialexpobad.qtcamerademo
• Windows / Linux: Normally no per-app prompt; ensure your OS privacy and device permissions allow camera use.

• CameraWidget sets up QMediaCaptureSession → QCamera → QVideoWidget + QImageCapture.
• PlatformPermissions_mac.mm requests camera permission (macOS only).
• StaticPlugins.cpp imports the darwin camera-permission plugin for Homebrew Qt.
• MainWindow hosts the widget; main.cpp creates the app.

• Add device selection (already in toolbar).
• Add video recording via QMediaRecorder.
• Port to QML by replacing the widget UI with VideoOutput + MediaCaptureSession.